SP-2815, Rectangular 28”X 14” Orbiting Pad, 1.5 HP motor, 3500 RPM Floor Machine 392 sq inches of cleaning surface (compared to 280 on SP-15 units) Up to 40% faster cleaning! Owner's Manual Available Now! Chemical Free stripping Model SP-2815, Rectangular 28”X 14” pad, 1.5 HP motor, 3500 RPM Model: SP-2815 UPC: 099053045045 Part No. 00-4504-7